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![Tips for difficult colorectal endoscopic submucosal dissection](https://image.oaes.cc/1f8f0a57-6846-45ac-afa9-9a17e8b6d480/4715.fig.1.jpg)
Figure 1. Pre-coagulation using an Endo-Knife: (A) a penetrating vessel exposed by dissecting submucosa; (B, C) pre-coagulation by forced coagulation with a low high-frequency power setting using an Endo-Knife; and (D) after cutting the penetrating vessel.